Head-mounted display device



FIG. 1 is a perspective view of a head-mounted display device showing our new design;

FIG. 2 is another perspec ie thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a rear view thereof;

FIG. 5 is a left side view thereof;

FIG. 6 is a right side view thereof;

FIG. 7 is a top view thereof; and,

FIG. 8 is a bottom view thereof. 

CLAIM The ornamental design for a head-mounted display device, as shown. 